Brinztech Alert: Alleged Database of ZoomInfo is on Sale

Dark Web News Analysis

A threat actor on a known cybercrime forum is advertising the alleged sale of a database containing approximately 1 million records of ZoomInfo company data. The dataset reportedly includes sensitive corporate contact information such as emails, phone numbers, and physical addresses.

Brinztech Analysis: While ZoomInfo has not released an official statement confirming a direct breach of their core systems as of November 2025, this alleged sale aligns with a broader trend of supply chain and third-party integration attacks targeting the B2B data sector.

• Potential Source: As a major data aggregator, ZoomInfo integrates deeply with platforms like Salesforce. Recent massive campaigns (such as the Salesforce/Salesloft Drift compromise noted in late 2025 security reports) have targeted these exact types of integrations to harvest contact data. It is plausible this “1 million record” subset was exfiltrated via a compromised third-party integration or client API key rather than a direct hack of ZoomInfo’s central database.
• Data Nature: The data described (emails, phones, addresses) is the core product ZoomInfo sells. However, in the hands of threat actors, this “business intelligence” becomes a “targeting list” for massive phishing and fraud campaigns.

Key Cybersecurity Insights

This alleged data sale presents a critical threat to businesses listed in the database:

• Supply Chain / Third-Party Data Risk: Whether ZoomInfo itself was breached or a third-party holding their data was compromised, this incident underscores the pervasive risk associated with data aggregators. If a threat actor compromises a single aggregator or its API, they gain downstream access to intelligence on thousands of companies.
• Increased Targeted Attack Risk: This data is a “goldmine” for Business Email Compromise (BEC). Attackers can use the accurate phone numbers and email addresses to launch highly convincing “vishing” (voice phishing) attacks, posing as vendors or executives to authorize fraudulent payments.
• Credential Stuffing Potential: The presence of corporate email addresses facilitates credential stuffing. Attackers often assume employees reuse passwords between their corporate logins and less secure third-party sites.
• Active Monetization: The ongoing sale on a hacker forum indicates active monetization. This suggests the data is perceived as “fresh” or high-value by the criminal community, increasing the likelihood it will be utilized in immediate attack campaigns.

Mitigation Strategies

In response to this claim, organizations utilizing ZoomInfo or similar aggregators must take immediate action:

• Enhanced Phishing and Social Engineering Awareness: Conduct immediate training for employees—especially in Finance and HR—on recognizing sophisticated phishing and vishing. Emphasize that attackers may possess accurate internal data (phone numbers, roles) to establish trust.
• Proactive Credential Monitoring: Implement continuous monitoring for compromised corporate email addresses on dark web marketplaces. Use tools to automatically flag and force password resets for any employee credentials found in leaks.
• Multi-Factor Authentication (MFA) Enforcement: Mandate and verify the implementation of strong, phishing-resistant MFA (like FIDO2 keys or app-based authenticators) across all corporate accounts. This creates a critical barrier even if credentials are exposed.
• Review Third-Party Data Handling: Re-evaluate security clauses with data providers. Ensure API keys used for integrations (like ZoomInfo to CRM) are rotated regularly and have restricted permissions (Least Privilege) to limit the blast radius of a potential key compromise.

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